<template>
    <div>
        <div class="shopcart">
            <div class="content" @click="toggleList">
                <div class="content-left">
                    <div class="logo-wrapper">
                        <div class="logo">
                            <span class="icon-shopping_cart"></span>
                        </div>
                        <div class="num" v-show="totalCount>0">{{totalCount}}</div>
                    </div>   
                    <div class="price" :class="{'highLight':totalPrice}">¥{{totalPrice}}</div>
                    <div class="desc">另需配送费¥{{ deliveryPrice }}元</div>
                </div>
                
                <div class="content-right">
                <div class="pay" :class="payClass" @click.stop.prevent="pay">
                    {{payDesc}}
                </div>
                </div>
            </div>
            <transition name="fold">
                <div class="shopcart-list" v-show="listShow">
                    <div class="list-header">
                        <div class="title">购物车</div>
                        <span class="empty" @click="empty">清空</span>
                    </div>
                     <div class="list-content" ref="listContent">
                        <ul>
                            <li class="food" v-for="food in selectFoods">
                                <span class="name">{{food.name}}</span>
                                <div class="price">
                                    <span>¥{{food.price*food.count}}</span>
                                </div>
                                <div class="cartcontrol-wrapper">
                                     <cartcontrol :food="food"></cartcontrol>
                                </div>
                          </li>
                        </ul>
                    </div>
                </div>
            </transition>
        </div>
        <transition name="fade">
            <div class="list-mask" @click="hideList" v-show="listShow"></div>
        </transition>
    </div>
</template>

 <script type="text/ecmascript-6">
    import BScroll from 'better-scroll';
    import cartcontrol from '../cartcontrol/cartcontrol.vue';

    export default {
            props: {
                selectFoods:{
                    type: Array,
                    default(){
                        return [{
                        }];//默认
                    }
                },
                deliveryPrice: {
                    type: Number,
                    default: 0
                },
                minPrice:{
                    type: Number,
                    default: 0
             }
        },
        data() {
            return{
                fold: true
            };
        },
        computed:{
            totalPrice() {
                let total = 0;
                this.selectFoods.forEach((food) => {
                    total +=food.price * food.count;
                });
                return total;
            },
            totalCount() {
                let count = 0
                this.selectFoods.forEach((food) => {
                    count +=food.count;
                });
                return count;
            },
            payDesc() {
                if (this.totalPrice === 0){
                    return `¥${this.minPrice}元起送`;
                }else if(this.totalPrice<this.minPrice){
                    let diff = this.minPrice - this.totalPrice;
                    return `还差¥${diff}元`;
                }else{
                    return `去结算`;
                }
            },
            payClass() {
                if(this.totalPrice < this.minPrice){
                    return 'not-enough';
                } else {
                    return 'enough';
                }
            },
            listShow() {
                if (!this.totalCount) {
                    this.fold = true;
                    return false;
                }
                let show = !this.fold;
                if (show) {
                    this.$nextTick(() => {
                        if (!this.scroll) {
                            this.scroll = new BScroll(this.$refs.listContent, {
                                click: true
                            });
                } else {
                            // 重新计算better-scroll高度
                            this.scroll.refresh();
                        }
                    });
                }
                return show;
            }
        },
        methods: {
            toggleList() {
                if(!this.totalCount) {
                    return;
                }
                this.fold = !this.fold;
            },
            hideList() {
                this.fold = true;
            },
            empty() {
                this.selectFoods.forEach((food) =>{
                      food.count = 0;
                })
            },
            pay() {
                if(this.totalPrice < this.minPrice){
                    return;
                };
                window.alert(`去支付${this.totalPrice}元`)
            }
        },
        components: {
            cartcontrol
        }
    };
</script>

<style lang="stylus" rel="stylesheet/stylus">
     @import "../../common/stylus/mixin"
    .shopcart
        position: fixed
        left: 0
        bottom: 0
        z-index: 50
        width: 100%
        height: 48px
        background: #000
        .content
            display: flex
            background: #141d27
            color :rgba(255,255,255,0.4)
            .content-left
                flex: 1px
                .logo-wrapper
                    display : inline-block
                    vertical-align: top;
                    position:relative
                    top:-10px
                    margin: 0 18px
                    padding: 6px
                    width: 56px
                    height: 56px
                    box-sizing:border-box
                    border-radius: 50%
                    background: #141d27
                    .logo
                        widht: 100%
                        height: 100%
                        border-radius: 50%
                        background: #2b343c
                        text-align: center
                        .icon-shopping_cart
                            font-size: 24px
                            line-height: 44px
                            color: #80858a
                    .num
                        position: absolute
                        top: 0
                        right: 0
                        width: 24px
                        height: 16px
                        line-height: 16px
                        text-align: center
                        border-radius: 16px
                        font-size: 9px
                        font-weight: 400
                        color: #fff
                        background: rgb(240,20,20)
                        box-shadow: 0 4px 8px rgba(0,0,0,0.4)
                .price
                    display: inline-block
                    vertical-align: top
                    margin-top: 12px
                    line-height: 24px
                    padding-right: 12px
                    box-sizing: border-box
                    border-right: 1px solid rgba(255,255,255,0.1)
                    font-size: 16px
                    font-weight: 700
                    color: rgba(255,255,255,0.4)
                    &.highLight
                        color: #fff
                .desc
                    display:inline-block
                    vertical-align: top
                    line-height: 24px
                    margin: 12px 0 0 12px
                    color: rgba(255,255,255,0.4)
                    font-size: 10px
            .content-right
                    flex: 0 0 105px
                    width: 105px
                .pay
                    height: 48px
                    line-height: 48px
                    text-align: center
                    font-size: 12px
                    font-weight: 700
                    &.not-enough
                        background: #2b333b
                    &.enough
                        background: #00b43c
                        color: #fff
        .shopcart-list
            position: absolute
            top: 0
            left: 0
            z-index: -1
            width: 100% 
            transform: translate3D(0,-100%,0) 
            &.fold-enter-active,&.fold-leave-active  
                transition: all 0.5s 
            &.fold-enter,&.fold-leave-active
                transform: translate3D(0,0,0)
            .list-header
                height: 40px
                line-height: 40px
                padding: 0 18px
                background: #f3f5f7
                border-bottom: 1px solid rgba(7,17,27,0.1)
                .title
                    float: left
                    font-size: 14px
                    color: rgb(7,17,27)
                .empty
                    float: right
                    font-size: 12px
                    color: rgb(0,160,220)
            .list-content
                padding:0 18px
                max-height:217px
                background: #fff
                overflow: hidden
                .food
                    position: relative
                    padding: 12px 0
                    box-sizing: border-box
                    border-1px(rgba(7, 17, 27, .1))
                    .name
                        line-height: 24px
                        font-size: 14px
                        color: rgb(7,17,27)
                    .price
                        position: absolute
                        right: 90px
                        bottom: 12px
                        line-height: 24px
                        font-weight: 700
                        font-size: 14px
                        color: rgb(240,20,20)
                    .cartcontrol-wrapper
                        position: absolute
                        bottom: 6px
                        right: 0    
    .list-mask
        position: fixed
        top: 0
        left: 0
        width: 100%
        height: 100%
        z-index: 40
        background: rgba(7,17,27,0.6)
        backdrop-filter: blur(10px)
        &.fold-enter-active,&.fold-leave-active  
            transition: all 0.5s 
        &.fold-enter,&.fold-leave-active
            opacity: 1
        
</style>